Crossword Genius

Makes forecast before wise guys (8)

Ross

I believe the answer is:

presages

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'makes forecast' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how they can define each other.

'before wise guys' is the wordplay.
'before' becomes 'pre' (prefix meaning 'before').
'wise guys' becomes 'sages' (I've seen this in another clue).
'pre'+'sages'='PRESAGES'

Can you help me to learn more?

(Other definitions for presages that I've seen before include "Forecasts" , "Foreshadows, is advance sign of" , "Foreshadows in press age" , "Augurs, bodes" .)

I've seen this clue in the Sydney Morning Herald.
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